弹簧的集合展示了一个新的FFF黑客攻击到3D PRINT Extreme悬垂，而无需使用任何支撑。
The technique has been developed byMakefast Workshop, a prototype and design bureau based in Dealware, Ohio.
此外，Makefast团队创建了一个G-code generator对于弹簧，向任何人开放实验。
3D打印在空中
As pointed out by the team at Makefast, midair 3D printing has been achieved before in a handful of experiments: either one offs, or in research labs. Most recently, for example, theUniversity of Illinois Urbana-Champaigndeveloped a hypnotizing technique for3D printing sugar sculptures在半空中。尽管此类发展可能在实验实验室环境中具有很大的潜力，但Makefast Workshop寻求一种方法，可以使制造商有机会在家中尝试这种技术。
当团队以相应的方式写Hackblog post, “Have you ever noticed that at the end of a print there’s sometimes a small thread of plastic that seems to follow the exact path of the extruder after it finishes printing? This is often caused by a little extra filament continuing to flow/ooze as the print head pulls away. The plastic is thin enough to cool as it moves, tracing out the path in midair,”
“尽管这些小线程不太可能非常有用，但我们想知道我们是否可以采用相同的方法有目的地追踪3D轮廓。”
How to 3D print extreme overhangs
至3D打印样品弹簧不使用支撑，Makefast解密至少四个基本观察结果。
首先，必须保持挤压流量近距离，大约为1：1。这样可以确保适量的塑料被挤出，不再挤压，因此弹簧不会太薄，或者只是在无法控制的混乱中渗出。
其次，打印速度必须非常慢，可以使塑料固化时间。尽管很小，但团队演示的每个弹簧都花了三到七分钟才能完成。
适当的细丝护理是必不可少的成功。被困在这些细丝中的任何水分都会导致弹簧的即时失败。
最后，必须为挤出机的拉力付出赔偿。结果，“圆柱线圈弹簧的G代码实际上在顶部附近稍微膨胀，以产生完工后直的弹簧。”
What does this mean for 3D printers?
The overall vision for this experiment is to develop some kind of method that makes 3D printing overhangs less dependent on angles and support structures.
As the team state, “Imagine a long overhang being accomplished by momentarily slowing down a print and snaking a strand of filament away from a part and then back. Making a set of these loops could then be used as a shelf to build up subsequent layers without requiring support underneath.”
Improvements to desktop FFF systems have been made before by experimenting with slicing and g-code. One example includes thevariable layer heightsetting introduced byPrusa Research与SLIC3R版本。通过添加此功能，它可以实现更平滑的印刷品，而无需完全牺牲打印时间。
虽然当前未通过切片软件提供空中设置，但Makefast Workshopcustom g-code generatoris certainly a good place to start for anyone looking to give this technique a try.
对于所有最新的3D打印机新闻和黑客订阅我们的newsletter. You can also follow us onFacebook和推特. Visit3D打印作业将您的职业发展到一个新的水平。
特色图片显示不同形状的弹簧3D未打印而无需支撑。通过Makefast Workshop的照片
